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M. To define time history parameters

To define arrival times and damping used for time history loads, use the following procedure.

You must first define a time history type by one of the previously described methods.
One set of time history parameters can be defined for your model for all time history load types.
  1. On the Loading ribbon tab, select the Time History > Parameters tool in the Dynamic Specifications group.

    The Define Param dialog opens.
  2. (Optional) Check the Time Step option and type the time step value. This is the solution time step used in step-by-step integration of the uncoupled equations. If not selected, the default value of 0.0013888 seconds is used.
  3. Select the Damping Type to use and, if explicit Damping is selected, type the damping ratio to be used for all modes.
  4. Type in one or more Arrival Times for the dynamic loads. Arrival time is the time at which a load type begins to act at a joint (forcing function) or at the base of the structure (ground motion).
  5. Click Add.
The time history load parameters are added to the Time History Definitions in the Load & Definition dialog.
In order to use a time history load definition, you must add a time history load item to a primary load case.
Parent topic: M. Time History Loads
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